A buffer extension spring, also known as a buffer spring or action spring, is a coiled spring located inside the buffer tube of AR-15, AR-10, and similar rifles. It absorbs recoil and returns the bolt carrier group to battery after each shot. The buffer extension spring works with the buffer tube (carbine or rifle length), buffer, lower receiver, stock, upper receiver, and bolt carrier group. It’s essential for smooth cycling, reliable operation, and proper function in AR-platform rifles of various calibers.
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